Grinding body and method of producing same



Apr. 10, 1923. 1,451,335

G. R. HANKS 1 GRINDING BODY AND METHOD OF PRODUCING SAME Filed Dec, 50, 1921 7 Patented Apr. 10,1923.

UNITED sures- "PATENT OFFICE- GEORGE BANKS, 01 HIGH BRIDGE, NEW JERSEY, ASSIGNOR TAYLOR-WHARTON I IRON AND STEEL COMPANY, OF HIGH.BRIDGE, NEW JERSEY ,..A CORPORATION OF NEW JERSEY.

GRINDINGBO'DY AND METHOD or PRODUCING SAME.

Application filed December 30, 1921. Serial No. 525,950.

To all whom it may concern .Be it known that I, GEORGE R. HANKs, a citizen of the United States, residing at High Bridge, in the county of Hunterdon and State of New Jersey, have invented certain new and useful Improvements in Grinding Bodies and Methods of Producing Same,

of which the following is a specification.

Objects of my invention are to provide for the rapid production of bodies intended for grinding purposes; to provide for the production of grinding balls free from piping and flashing; and to provide a. continuous method of production which will, at one 5 heat, form the slug or blank, densify the same to the ultimate or ball shape, and finally impart the necessary wear and shock resistive properties by appropriate heat treatment.

The invention will first be described in connection with the accompanying drawings forming a part hereof, and will then be defined in the claims.

In said drawings,

Figure 1 is a general view of apparatus suitable for use in practicing the invention.-

Fig. 2 is an elevational view of a ball slug. Fig. 3 is a'similar view of a modification; and i Fig. 4 is ball.

According to my inventiom-molten metal a perspective view ofa finished is poured into a mold designed to produce a slug a substantial portion of which is of the ultimate shape ofthe finished grinding body, and the remainingportion of which contains a predetermined amount of metal to complete the article. In short, I provide for a minimum displacement of metal and thusobviate objectionable flashing, regardless of whether the displacement is efiected by a hammer or in a .press. w i

The slug may be half spherical as at a in Fig. 2, with an ofi'set displaceable-portion b,

the part a fitting one of the dies of a suitable forging mechanism, while the oflset portion me. be of frusto-conical or tapered form. sometimes, however, make} slug such as is shown at 0 in Fig. 3, in' 'w-hich while maintaining a part contoured to fit the die d, the latter is required to cooperate in the forging operation by the extension of the slug in straight lines spaced from the side walls of the die. In either event there is a predetermined .amount of metal to be displaced and there is no flashing.

In the layout, Fig. 1, a ladle 5 carried by an overhead crane 6 serves molten metal to a travelling chain of molds 7, each of which forms a slugB of the character indicated. The molds are parted in the usual manner, and as the chain advances the slugs fallinto a runway 9 and are delivered in any appropriatemanner to a die or displacing mechanism 10. The latter may form an element of a press or of a hammer. In either case the slug 8 adapts itself to the lower'die, as indicated at 11 in Fig. 1, so that the displacement'of metal is reduced to the minimum. The empty'molds are cooled for reservice by passing them through a cooling tank 12.

The balls 13 are ejected from the die in any appropriate manner, and use is made of their residual heat to toughenor harden them by, for'example, treating them in a tank 14. After quenching the residualheat,

the balls are transferred to a car 15 through the medium of an endless elevator 16.

Having described the nature and objects of my inventioinI 'claim,'

1. A continuous method of making grinding bodies at one heat, which consists in casting aslug having a substan tial part thereof of the ultimate shape of thefinished product, forgingythe slug, while hot from the heat of casting, to the ultimate form desired, an

rapidly cooling the, forged product. 1

. 2. A continuous method of making grinding balls at one heat, which consists in pouring molten metal'to form a slug which is in part spherical and in part of displaceable form, the latter containing enough metal to complete the ball, and then forging the slug.

3. A continuous method of making grinding balls, which consists in pouring molten metal to form a slug having a portion thereof of the ultimate shape of the finished product, and'having a displaceable portion. forging the slug to ball shape, and utilizing the residual heat of the ball to harden it.

4. A continuous method of making grinding balls at one heat, which consists in pouring molten metal to form a slug which is in part spherical and in part frusto-conical in form, the latter containing enough metal to complete the ball, and then forging the slug.

5., A-continuousmethod of making grinding bodies at one heat, which consists in cast- -ing a slug having a substantial part thereof while hot from the heat of ('asting to the ultima'te form desired, and utilizing the residual heat in appropriate heat treatment of the forged product. v

6. A slug for use in forming a grinding body, consisting of a casting having a major portion of the ultimate shape of the grinding body and having an ofiset displaceable portion containing sufiicient metal to complote the grinding body without flashing.

T. As an article of manufacture, a commeroial grinding bod y consisting of an integral element whereof the major portion is shaped by casting and whereof the remaining portion is shaped by working; said grinding body being toughened by quenching the residual heat of the casting.

In testimony whereof I afiix my signature.

GEORGE R. HANKS. 

